Evaluation Method of Strapdown Aeronautical Gravimetry Accuracy Based on Repeated Lines
A technology for aviation gravity and measurement accuracy, which is applied in the direction of measuring devices, gravitational field measurement, geophysical measurement, etc., can solve problems such as inability to efficiently evaluate strapdown gravity measurement accuracy, and achieve the effect of reducing costs
Active Publication Date: 2020-09-08
湖南省导航仪器工程研究中心有限公司
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[0005] Aiming at the problem that the classic aviation gravity evaluation method cannot efficiently evaluate the accuracy of strapdown gravity measurement, the present invention proposes a method for evaluating the accuracy of strapdown gravity measurement based on repeating lines from the perspective of the error characteristics of strapdown gravity meters and the system
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[0024] The accuracy evaluation method in the present invention will be further elaborated below in conjunction with the accompanying drawings and an actual airborne gravity measurement experiment. The organization and implementation of the experiment is shown in Table 1.
[0025] Table 1
[0026]
[0027] Step 1. In this measurement task, the air route between the carrier and the survey area and the airport becomes a repeated line through track planning, and the route of the repeated line and the survey area are as follows: figure 1 As shown, it is also possible to directly collect the repeat line flight data of the strapdown aviation gravimeter in the early stage. A total of 22 experimental lines were obtained from 13 flight sorties after removing the influence of factors such as route conflicts, and the standard deviation of the pitch angle and roll angle of each survey line measured by the strap-down aviation gravimeter in these repeated lines were calculated , standard...
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The invention belongs to the field of the gravity measurement, and discloses a strap-down airborne gravity measurement precision assessment method based on repeated line. The method is different fromthe inner and external coincidence assessment method in that the repeated line data obtained by utilizing the early repeated line measurement data or flight path planning is used as the basis, and then a precision assessment model between four key indexes such as astronomic bearing specific force standard deviation, horizontal specific force standard deviation, pitch angle standard deviation and roll angle standard deviation and the internal coincidence precision is established through multielement regression analysis. After the new airborne gravity measurement is accomplished, four key indexes are counted and the precision assessment model are substituted into the same to obtain the precision assessment. Compared with the classical internal and external coincidence precision assessment method, the assessment method disclosed by the invention does not need additional flight or external reference information, the cost of the gravity measurement is reduced, the measurement efficiency isimproved, the real-time precision assessment can be realized; and the method is the new discovery of the strap-down gravity measurement data mining aspect, and has high theoretical value and actual significance.
Description
Technical field: [0001] The invention belongs to the field of gravity measurement, and relates to a strapdown aviation gravity measurement precision evaluation method, in particular to a strapdown aviation gravity measurement precision assessment method which is different from internal and external coincidence precisions and establishes an evaluation model by repeating line flight. Background technique: [0002] Gravity information plays a key role in geodesy, geophysics, and resource exploration. Compared with other gravity measurement methods, airborne gravity measurement can not only meet the requirements of gravity measurement accuracy and resolution in various application fields, but also take into account the advantage of high efficiency. The gravimeters used in aviation gravity measurement are usually divided into two types, one is a platform-type gravimeter, and the other is a strap-down gravimeter. Compared with the platform-type gravimeter, the strap-down gravimet...
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IPC IPC(8): G01V7/00G01V13/00
CPCG01V7/00G01V13/00
Inventor 吴美平王明皓曹聚亮蔡绍琨于瑞航杨阳刘伟
Owner 湖南省导航仪器工程研究中心有限公司